3 ms·

I bonked out hard after going on a run after eating only a banana since waking up. Now I always make sure I've had at least a few hundred calories

• foldr 8y ago
  Do you fast, though? If you're used to eating before exercise, there'll be a big psychological barrier.
• elbear 8y ago
  That's because you ate that banana. That stimulated insulin release and your body couldn't use fat as energy.